Abstract
1. 1. Plasma progesterone concentration in deluteinized female lizards, as determined by radioimmunoassay, did not decrease significantly, as compared to non-surgical controls until 48 hr after surgery. 2. 2. Sham surgery induced a significant increase in plasma progesterone concentration 24 hr after surgery. Progesterone concentration then declined to an intermediate level not significantly different from non-surgical control or deluteinized females. 3. 3. Plasma progesterone concentration in non-surgical control specimens exhibited no significant changes during the 96 hr in which animals were examined. 4. 4. Oviposition did not occur in the control or sham groups whereas three of eight of the deluteinized females did oviposit by 48 hr.
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